/Engine/Source/Runtime/Engine/Classes/Engine/AssetManager.h
Returns the list of Chunks that are not currently mounted, and are required to load the referenced assets. Returns true if any chunks are missing
virtual bool FindMissingChunkList ( const [TArray](API\Runtime\Core\Containers\TArray)< [FSoftObjectPath](API\Runtime\CoreUObject\UObject\FSoftObjectPath) > & AssetList, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & OutMissingChunkList, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & OutErrorChunkList ) const